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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5614fac9d3376aa86513888dbb7faec7e17e9868cd98a6afcb2abfef13d72fb6' 
  AND token = '+X2gDV+94BL6BoeP2yVHFN9ktKF96CmC/1TTmsSsXBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}