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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e36298f49659988eb0f903dd83a7bcf5e131ba0b0dc43fe4d7d2c29eb8f2ebc2' 
  AND token = '/HUUUE/bS25Rvae6jImQxe8bqmpnXoDbQfjHv0ksiRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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