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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '261c7c90d9c93f988c62fdace601dbd837b430d70f70c4c4ec0bc521187b734a' 
  AND token = 'He4PdDtZ1zAxsq7kjzv2q06gQHGwK/0Xv7q2PfugsjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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