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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11ad9ff764120e2b67a41b171c8cd698be3454108c15dc1da520293cdf78bd72' 
  AND token = 'HZvG/7sThNKoYS4saFl71uD2Dj2kj05pjcvm0KEpH3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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