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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eba7e3c7584e60c6c2e39f668fbc3d477f4ba8526f98c425e7e2eb827970efa' 
  AND token = 'ZjtcWyrXOmZNGKc6XpCm+F8yLPnA9YSDtOemXZUlny0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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