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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '587f11f4e638932a639c1afc9ac288fc7445bd3dd02c2d227dc69ad21ca06fbb' 
  AND token = '7iFGWsjUuj0OJCcckiklTZ1rmhVYshdAChHkxJ7D/nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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