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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5199633c92879b53c96d4e9e05bd9fe2057dc3eebe76d93e4a516a8ddbf8dd2' 
  AND token = 'H05FN/e/hW4UFAsg+NAwWJjBe/QpLVUe/2UVXDZvfKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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