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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd55f07043cce93b940b50157ad726f35ceb7083da4e1ca8600ed54afa542f55' 
  AND token = 'LNKimqvqB6jcCfPidffGHNvLwHGI2TPkzTe/CuhF9zQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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