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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a4dc7c1c77da7a9f67ec89c5dca941f6925e9cc240b5c80d854c9d7333149c6' 
  AND token = 'M77KmfWgfyovJTSV0UthYuguj4mdpKYaV/lMwa+pXtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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