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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34206c6dd8c3e87f151268da18ef3880fae0268d37a139d075cbaefd48baffb5' 
  AND token = 's0wUhlYPk9YPLP6dOQwSBSIY1JTDU0yykE3c7ULdOyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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