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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d5d79c2632aed67f56780b75b8a97b6da2759200b9308abe3df7a67f7de5eb8' 
  AND token = 'gBbp6k4J5dv+8Xnp1kC0Nd9l5r0qjqhH870hMg37OWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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