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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92ad29780c07437b0fdf04f1970a9797e42f09e4ebf429d2e7fec4ccab4a605c' 
  AND token = 'O1ocmWA79hvIoVQ1B48fyQ48gbXlm40H0xVqSAEMGrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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