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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc0c1a46a7d7222d000ac7b1cfc07addee36986dfd0bfa482b9c98fd8a2e51a8' 
  AND token = 'f7FhqhohPyNb7GUWLrfg+l3U891JHCQpbrFYfgGTN6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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