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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a94a0906b37d74a175baffe284d1434a9de74b1dd8a135cbb9395df4a9b11a18' 
  AND token = 'dfvYnBcmKwOSRujlST3iRmiDdhw+Fc2+GI/YnkcC/4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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