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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb1793f7a1189a9ce2c962d30b67449e95dca30f02c0e2c8cb1d21bbdfb92679' 
  AND token = 'M04JVDogVAxzZ7pzZ5XtWNNpCV5Sp9Z/84hTQWAOreQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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