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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a0901c2e1a43483de2a7505abe4366b53a4f908067e0c61e6480f9620549e46' 
  AND token = 'QAGKpjfwlGA14BZjVUpJ8SbJ2rbCIQdfeKC+CHzCuEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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