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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b119ebc3de27fcedb1c2f5a4b077ab47257972df4f486a853e2ef8c89397479c' 
  AND token = 'EIf4TBbuiXHyUPKOMrCio+MkmK52PttgqSsx2HO22zU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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