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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd83b5d7de97c89f2f8343028f16b4eea4c5e9f6032306c25eb4230bc3a4c1124' 
  AND token = 'j5ckSzK3tEao7PzZKzH+YZa61ODZ2P+Gv5B6VGESklQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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