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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '757fca92d42bd02c49c9c1674d33c60678359ad6ba27bef2dafd3a9ace24f2f0' 
  AND token = '8iCkkjwJ7hgkT4dAb6Fw15QeocVp7q1MKU9h2QiV/gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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