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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2a23299732027fbf4fff47ca9c305984ad4222e371bb24aaf10f13742388807' 
  AND token = 'RujS46CSc1rv2/xN/l38mLCNlZJAVflDz9ZdZ/y90gU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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