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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '026559eb930948eb9e5fd56acc6c6e9e9e98d7fcb5d89192a289b4e56ae073d5' 
  AND token = 'GaTBoXE8JF/XLQYzDGVl0mxbwwF6dpG0j9ChMEX8jBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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