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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbc1ecf4f2b9a983a713fbdb363803c46bbf7a1b7d76ec3a0626f7f646b4b20d' 
  AND token = 'thL6bWjWjVMTeeL/BGuLcQMLbpkjkmIXvi9//b9Gg8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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