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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6bca5c1cdd09074176bfcb76e49dea54b293d9b680596d39af3594522de26c6' 
  AND token = '3r5RFgbbRuvu22lsEGDpNpdxY/13YHHrf23FgUtej1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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