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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '147817fd174a6ec1ac129d8dc29091f181f76e331ab16c196beefe537049d860' 
  AND token = '94STNkgspvED21iHwigUL4ROdL/Irkryo8osOfIoPLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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