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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbbbb1034cedd135be8bf2fbaaacb0676f91ca09a7120e96a47248547fcd9ce2' 
  AND token = 'fsOnmiq0LE9Ke1bCIwRUXCfsO7qg5c0c0St+imLHEEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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