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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fc6e51a31756ed457fb9de18fbd69b9e0e087cb42a8e6ad19ba9ecf1321ebb8' 
  AND token = 'cEUolFSMVDPiaOuv+ptC/C73/ZqYXDL4Q0uu1IRc3Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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