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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bd4eac7c7d5a0ae18403c0f1f5a875d7e4592237ce992c1217e569848460c2d' 
  AND token = '7CBRhWYI6CtD6UK2fjwj1szi4Hqr4eE5+iXKqR85y04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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