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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f004bda794f956c41cfd4cf2120b595cbbd85f1769a593b44fbf3fcf381f109f' 
  AND token = '0fY0hDUYjgKdX7rknzuucaH0aHGa1MbQt/P8lR5X5OQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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