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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd325d1d16b1a0206ee3e2080c815d8488ca71bc835337084f915ee0a33db050' 
  AND token = '6pG6ZpoDcOJzAacOQlMw9GRgsqPjz45uei91UgMgBIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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