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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29006314ed9856afc19b1447a8bde6a5d44eea6b3a1e54dc9f532ca157dac19e' 
  AND token = '5w2ZXhE6G2ViBy3LhrFMPtVvv9ViRokKSgH5wKyh1kA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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