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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04685eb5488c21f0fde98f5fab41a7db260fd3f1cb3b87cf8ccc29977e48db7e' 
  AND token = 'iNojzyarXI1jGtud9/UMk0LjpVhslZCDkGIDl71CDR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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