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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3b720cc6134348dd557a5ed3608aacdd67984c6ee001d43968d64baf2f1b07f' 
  AND token = 'Jt+8npdAGYUWXXA2cDeJuNInZp+0dHb1WXPwLI3zFMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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