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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee2d43be37c36f84c18dea4c4b291f353f429f36a1f002db6392d86c95722688' 
  AND token = 'EevIg+v269pQ9O+jdWWwG+Cg2bTcqH7mAmv+cQv+9hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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