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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76d0d4db127b4e3d97ea6ad062e9a904e1764eb48ccaea9ef361dc04f4384ee1' 
  AND token = 'oMs1P6DNHocMKUG4Znhzv2FW6jAjSnSLEHfFWUMEjFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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