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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '533d5621a8f6ec3b521808393c2536a2ee65ea58f451137f844c20322ad9a3f5' 
  AND token = '9GC66yCATIGAcAt6lRGuDn/GhxkxAePn9mEoukW33eU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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