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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1948af92238ee75f1d826b0a66b55fa7d51ab68a779ba2e2f8b090a97971837f' 
  AND token = 'fXaYL1DvPKCDJpr6uG2S8i8NbtPBX1FWaNu0ueUcK0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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