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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f650f2a5b776ca5b91f5f3c0ad3ef5b6cd4e97729375b07b24563fa230bfd912' 
  AND token = 'ihEFnX9MdbsSKAf2OKxsY7JcbWQEiAcOqIec7AW/euU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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