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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58c832ab31c28cf64da83d99a2752ee6e34421df5920740afc42803b13b97e19' 
  AND token = '/wbpRAXug/gaqofX0d92eKXSZaR2V1/Isgd9C9bsbbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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