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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13416f64bef85989b8654394fb10b98bc5cf0df054d4e9a61e42698671a0dd8a' 
  AND token = '1f3g9v/63DcEiLeYRS6e6cGJHe5J9xR5jgRWmA2ZU8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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