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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62ed08af961d52bfb19515e90af52ce3c24132ee7da366fb79ca5f64865f13c0' 
  AND token = 'fD9x7BE/t98ZeSRCTJL+l9FcMVMAK+3QcGyFiM99TrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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