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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d9c499ff005f6121712087df95bbf8e02b449d54ff3a3c1414cd6c13f6aeef8' 
  AND token = 'Ubq2FqbtCkGiZbbcV6OnQ01g2mJOenI1vonzk4JQE+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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