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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5da1ec856578358728cf14e57d667a8b6f8bbf4dc1afd25a1f2c1e71e37397e0' 
  AND token = '/5JIkB+1JK1HRvYdJLX5DCvR8gdvoqtBPpgD5oft8cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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