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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba70b01b434a48d640785e35db2e570d5dc79c828541f4a72a85c7fc2f7af495' 
  AND token = '4Pxw6k1nln6qIvslOo0bpzH+OOQW9XbFiw+XLE3JwUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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