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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '171166d7af60cfdda893e29fdd471e7a47f18333df42f82f006b7fedb8ac5be5' 
  AND token = '5ch7SBb5VM9g/lDapBJGrRHM4LB10jpGJ3ivpjrpNi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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