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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08813224f2fd62a3d03a9bb01a90b12a85799b94efe3c57f58972c73f0ec3c7f' 
  AND token = 'CGsIUueWqPQKO2EiFRs80aAZnXcbyAASJpsFE3QH2c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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