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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0a40c9cd85f07306bd328905ddef4865c97eccd7ca42c899094c1a9f83ce9a0' 
  AND token = '4pK3AR23+7ff6dcwFRHsrn8MbjcjpG1jzLYy6EO4Pb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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