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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c042e0959a9bda9c656587047099add7c0663c6b2e07c46ee7b77dd89cc4650' 
  AND token = 'IQ9JNOS2rS07tvPnnGpl1j8O2WxcpGVMq3fRR496vx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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