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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15dcfd04ff70aea7f1279ad019e5beb37f59cfe904f270723f4cb6e5b3061dad' 
  AND token = 'y7j2zfH7/3UcLUf2zAVTLzX/relQxo8SyQglFgKI6H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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