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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbadb3ddda33562b035afa2866eaa043543dd8efd2c87475e2090d259c1ac58b' 
  AND token = 'dixV7BMel4wG0meGzXmagzPAf8u6i6qMc30I5uJRb9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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