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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '018237fcfe2d6ad9f6a5a4ae56c22981d4152ebd279a80d4bd1dfb926ec5182c' 
  AND token = 'IfJXy62TzMD6TUEd4Y4dUHbWUJRDNzZS43qObCgRwDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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