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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3fc2edc574366dcdf0faa06cafb5c18b74237b590c34a99d1b2e4208b11d0de' 
  AND token = 'N3XyT7Spwl67bkZ7tvY7kuhgAwoH5VRCQWTBM9oyaxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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