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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfde2871d942d62c12feb694eb38d9aed2d0f837facc52a2df9b03077aaa1204' 
  AND token = '6YPutoGHobWHnsKi3jTX6P2MUkoHZ7Lg+z9zkG23KR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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