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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0912082715cc34f35d5be03c221be520e612d00c6dd426f4d34159984b4f065e' 
  AND token = 'jStogfp1Z7s8QqscSZvng0Ra+jzdHMUn7J8LY372o4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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